Correlating atomic-scale structural and compositional details of Ca-doped LaCO3 perovskite nanoparticles with activity and stability towards the oxygen evolution reaction

Bai F, Schulwitz J, Priamushko T, Hagemann U, Kostka A, Heidelmann M, Cherevko S, Muhler M, Li T (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Journal of Catalysis Elsevier

Book Volume: 438

Article Number: 115697

DOI: 10.1016/j.jcat.2024.115697

Abstract

Developing efficient oxygen evolution reaction (OER) electrocatalysts requires a thorough understanding of structure–activity-stability relationships, ideally at the atomic scale. Herein, we employed atom probe tomography and transmission electron microscopy to reveal compositional and structural changes on LaCoO3 and Ca-doped LaCoO3 surfaces during OER. We reveal that the topmost surfaces of pristine perovskite are terminated by the A-site element (La). After OER, amorphous La(OH)3 is formed on the surfaces of LaCoO3, which leads to significant activity deterioration. For Ca-doped LaCoO3, enhanced intercalation and penetration of hydroxide ions, along with the appearance of Co3+/4+ redox couple, are observed, contributing to its enhanced OER activity and stability. Our study demonstrates how atomic-scale compositional and structural details of electrocatalyst surfaces deepen our understanding of their activity and stability.

Involved external institutions

Ruhr-Universität Bochum (RUB) DE Germany (DE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Universität Duisburg-Essen (UDE) DE Germany (DE)

How to cite

APA:

Bai, F., Schulwitz, J., Priamushko, T., Hagemann, U., Kostka, A., Heidelmann, M.,... Li, T. (2024). Correlating atomic-scale structural and compositional details of Ca-doped LaCO3 perovskite nanoparticles with activity and stability towards the oxygen evolution reaction. Journal of Catalysis, 438. https://doi.org/10.1016/j.jcat.2024.115697

MLA:

Bai, Fan, et al. "Correlating atomic-scale structural and compositional details of Ca-doped LaCO3 perovskite nanoparticles with activity and stability towards the oxygen evolution reaction." Journal of Catalysis 438 (2024).

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